I've had dealings with negative spirits as well.

I went through a period where my protective shield (a glamour that I'd worked on for YEARS) had been peeled away and I couldn't re-do a shield until the old had gone (which was what needed to happen - glamours are quite powerful magic & I didn't need to "hide" behind it anymore). While this was happening I was more susceptible to "attacks" than normal.

One major one which could have been really nasty was when I was walking down my back stairs on my way to work and I felt hands in the middle of my back push me - I know there was nobody there, I took a tumble down the stairs and hairline fractured my hip and tore ligaments in my knee.

I know my DH's x has a few of his things and she like to call herself a "practising pagan" (she's on facebook - I'm keeping an eye on her) - I know lately she's been trying to get at him, much as she says she is happy for him to be married I know she still has very strong feelings for him (bordering on hate), so a lot of my energies are going on protecting him at the moment. I've got a girlfriend who also knows DH's x who is helping me with this.